Isotopes of indium

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Indium (49In) consists of two primordial nuclides, with the most common (95.7%) nuclide (115In) being measurably though weakly radioactive. Its spin-forbidden decay has a half-life of 4.41×1014 years, much longer than the currently accepted age of the Universe.

Isotopes of indium (49In)
Main isotopes Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
111In synth 2.8048 d ε 111Cd
113In 4.28% stable
115In 95.7% 4.41×1014 y β− 115Sn
Standard atomic weight Ar°(In)
  • 114.818±0.001
  • 114.82±0.01 (abridged)
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The stable isotope 113In is only 4.3% of naturally occurring indium. Among elements with a known stable isotope, only tellurium and rhenium also have all stable isotopes in lower abundance than a long-lived radioactive isotope, but the discrepancy is not so striking. Other than 115In, the longest-lived radioisotope is 111In, with a half-life of 2.8048 days. All other radioisotopes have half-lives less than 5 hours. This element also has 47 isomers, the longest-lived being 114m1In, with a half-life of 49.51 days. All other meta-states have half-lives also less than 5 hours.

Indium-111 is used medically in nuclear imaging, as a radiotracer nuclide tag for gamma camera localization of protein radiopharmaceuticals, such as In-111-labeled octreotide, which binds to receptors on certain endocrine tumors (Octreoscan). Indium-111 is also used in indium white blood cell scans, which use nuclear medical techniques to search for hidden infections.

Several proton-rich isotopes of indium have been used to help measure the mass of the doubly-magic isotope tin-100.

List of isotopes


Nuclide
 Z N Isotopic mass (Da)
 Half-life
 Decay
mode
 Daughter
isotope
 Spin and
parity
 Natural abundance (mole fraction)
Excitation energy Normal proportion Range of variation
96In 49 47 95.95911(54)# 1# ms
[>400 ns] 		β+? 96Cd 9/2+#
p? 95Cd
97In 49 48 96.94913(43)# 36(6) ms β+ (97.7%) 97Cd 9/2+#
β+, p (2.3%) 96Ag
p? 96Cd
97mIn 400(100)# keV 0.12(7) ms p? 96Cd 1/2−#
98In 49 49 97.94213(33)# 30(1) ms β+ (>99.87%) 98Cd (0+)
β+, p (<0.13%) 97Ag
98mIn 820(730) keV 890(20) ms β+ (56%) 98Cd (9+)
β+, p (44%) 97Ag
99In 49 50 98.93411(32)# 3.11(6) s β+ (99.71%) 99Cd 9/2+#
β+, p (0.29%) 98Ag
100In 49 51 99.9311019(24) 5.62(6) s β+ (98.34%) 100Cd 6+#
β+, p (1.66%) 99Ag
101In 49 52 100.926414(13) 15.1(11) s β+ (>98.3%) 101Cd (9/2+)
β+, p (<1.7%) 100Ag
101mIn 640(40) keV 10# s β+? 101Cd 1/2−#
IT? 101In
102In 49 53 101.9241059(49) 23.3(1) s β+ (99.99%) 102Cd (6+)
β+, p (0.0093%) 101Ag
103In 49 54 102.9198788(96) 60(1) s β+ 103Cd (9/2+)
103mIn 631.7(1) keV 34(2) s β+ (67%) 103Cd (1/2−)
IT (33%) 103In
104In 49 55 103.9182145(62) 1.80(3) min β+ 104Cd (5+)
104mIn 93.48(10) keV 15.7(5) s IT (80%) 104In (3+)
β+ (20%) 104Cd
105In 49 56 104.914502(11) 5.07(7) min β+ 105Cd 9/2+
105mIn 674.09(25) keV 48(6) s IT 105In (1/2)−
β+? 105Cd
106In 49 57 105.9134636(13) 6.2(1) min β+ 106Cd 7+
106mIn 28.6(3) keV 5.2(1) min β+ 106Cd (2)+
107In 49 58 106.910287(10) 32.4(3) min β+ 107Cd 9/2+
107mIn 678.5(3) keV 50.4(6) s IT 107In 1/2−
108In 49 59 107.9096937(93) 58.0(12) min β+ 108Cd 7+
108mIn 29.75(5) keV 39.6(7) min β+ 108Cd 2+
109In 49 60 108.9071497(43) 4.159(10) h β+ 109Cd 9/2+
109m1In 649.79(10) keV 1.34(6) min IT 109In 1/2−
109m2In 2101.86(11) keV 210.0(9) ms IT 109In 19/2+
110In 49 61 109.907171(12) 4.92(8) h β+ 110Cd 7+
110mIn 62.08(4) keV 69.1(5) min β+ 110Cd 2+
111In 49 62 110.9051072(37) 2.8048(1) d EC 111Cd 9/2+
111mIn 536.99(7) keV 7.7(2) min IT 111In 1/2−
112In 49 63 111.9055387(46) 14.88(15) min β+ (62%) 112Cd 1+
β− (38%) 112Sn
112m1In 156.592(25) keV 20.67(8) min IT 112In 4+
112m2In 350.80(5) keV 690(50) ns IT 112In (7)+
112m3In 613.82(6) keV 2.81(3) μs IT 112In 8−
113In 49 64 112.90406045(20) Stable 9/2+ 0.04281(52)
113mIn 391.699(3) keV 1.6579(4) h IT 113In 1/2−
114In 49 65 113.90491641(32) 71.9(1) s β− (99.50%) 114Sn 1+
β+ (0.50%) 114Cd
114m1In 190.2682(8) keV 49.51(1) d IT (96.75%) 114In 5+
β+ (3.25%) 114Cd
114m2In 501.948(3) keV 43.1(6) ms IT 114m1In 8−
115In 49 66 114.903878772(12) 4.41(25)×1014 y β− 115Sn 9/2+ 0.95719(52)
115mIn 336.244(17) keV 4.486(4) h IT (95.0%) 115In 1/2−
β− (5.0%) 115Sn
116In 49 67 115.90525999(24) 14.10(3) s β− (99.98%) 116Sn 1+
EC (0.0237%) 116Cd
116m1In 127.267(6) keV 54.29(17) min β− 116Sn 5+
116m2In 289.660(6) keV 2.18(4) s IT 116m1In 8−
117In 49 68 116.9045157(52) 43.2(3) min β− 117Sn 9/2+
117mIn 315.303(11) keV 116.2(3) min β− (52.9%) 117Sn 1/2−
IT (47.1%) 117In
118In 49 69 117.9063567(83) 5.0(5) s β− 118Sn 1+
118m1In 100(50)# keV 4.364(7) min β− 118Sn 5+
118m2In 240(50)# keV 8.5(3) s IT (98.6%) 118m1In 8−
β− (1.4%) 118Sn
119In 49 70 118.9058516(78) 2.4(1) min β− 119Sn 9/2+
119m1In 311.37(3) keV 18.0(3) min β− (97.4%) 119Sn 1/2−
IT (2.6%) 119In
119m2In 654.27(7) keV 130(15) ns IT 119In (3/2)+
119m3In 2656.9(18) keV 265(10) ns IT 119In (25/2+)
120In 49 71 119.9079875(33) 3.08(8) s β− 120Sn 1+
120m1In 90.1(26) keV 46.2(8) s β− 120Sn 5+
120m2In 90.1(26) keV 47.3(5) s β− 120Sn 8−
121In 49 72 120.9078416(13) 23.1(6) s β− 121Sn 9/2+
121m1In 313.68(7) keV 3.88(10) min β− (98.8%) 121Sn 1/2−
IT (1.2%) 121In
121m2In 2550(100)# keV 7.3(2) μs IT 121In (25/2+)
122In 49 73 121.9103046(13) 10.3(6) s β− 122Sn 5+
122m1In <15 keV 10.8(4) s β− 122Sn 8−
122m2In 77.2(15) keV 1.5(3) s β− 122Sn 1+
123In 49 74 122.9104679(12) 6.17(5) s β− 123mSn 9/2+
123m1In 327.21(4) keV 47.4(4) s β− 123Sn 1/2−
123m2In 2078.1(6) keV 1.4(2) μs IT 123In (17/2−)
123m3In 2103(14)# keV >100 μs IT 123In (21/2−)
124In 49 75 123.9131390(34) 3.67(03) s β− 124Sn 8−
124mIn 24.2(26) keV 3.12(9) s β− 124Sn 3+
125In 49 76 124.9136738(19) 2.36(4) s β− 125mSn 9/2+
125m1In 352(12) keV 12.2(2) s β− 125Sn 1/2−
125m2In 2009.4(7) keV 9.4(6) μs IT 125In (19/2+)
125m3In 2161.2(9) keV 5.0(15) ms IT 125In (23/2−)
126In 49 77 125.9164682(45) 1.53(1) s β− 126Sn 3+
126m1In 90(7) keV 1.64(5) s β− 126Sn 8−
126m2In 243.3(2) keV 22(2) μs IT 126In 1−
127In 49 78 126.9174539(14) 1.086(7) s β− (>99.97%) 127mSn 9/2+
β−, n (<0.03%) 126Sn
127m1In 407.9(50) keV 3.618(21) s β− (99.30%) 127mSn 1/2−#
β−, n (0.70%) 126Sn
127m2In 1728.7(12) keV 1.04(10) s β− 127mSn (21/2−)
β−, n? 126Sn
127m3In 2364.7(9) keV 9(2) μs IT 127In (29/2+)
128In 49 79 127.9203536(14) 816(27) ms β− (99.96%) 128Sn (3)+
β−, n (0.038%) 127Sn
128m1In 247.87(10) keV 23(2) μs IT 128In (1)−
128m2In 285.1(22) keV 720(100) ms β− 128Sn (8−)
IT? 128In
β−, n? 127Sn
128m3In 1797.6(16) keV >0.3 s β− 128Sn (16+)
IT? 128In
β−, n? 127Sn
129In 49 80 128.9218085(21) 570(10) ms β− (99.77%) 129Sn 9/2+
β−, n (0.23%) 128Sn
129m1In 449.1(59) keV 1.23(3) s β− (96.2%) 129Sn 1/2−
β−, n (3.6%) 128Sn
IT? 129In
129m2In 1646.6(33) keV 670(100) ms β− 129Sn (23/2−)
IT? 129In
129m3In 1687.97(25) keV 11.2(2) μs IT 129In (17/2−)
129m4In 1927.6(33) keV 110(15) ms IT 129In (29/2+)
β−? 129Sn
130In 49 81 129.9249523(19) 273(5) ms β− (99.07%) 130Sn 1(−)
β−, n (0.93%) 129Sn
130m1In 66.5(27) keV 540(10) ms β− (98.20%) 130Sn (10-)
β−, n (1.80%) 129Sn
130m2In 385.4(26) keV 540(10) ms β− (98.20%) 130Sn (5+)
β−, n (1.80%) 129Sn
130m3In 388.3(2) keV 4.6(2) μs IT 130In (3+)
131In 49 82 130.9269728(24) 261.5(28) ms β− (97.75%) 131Sn 9/2+
β−, n (2.25%) 130Sn
131m1In 376(3) keV 328(15) ms β− (97.75%) 131Sn 1/2−
β−, n (2.25%) 130Sn
IT? 131In
131m2In 3750(90) keV 322(41) ms β− (88%) 131Sn (21/2+)
β−, n (12%) 130Sn
IT? 129Sn
131m3In 3783.6(5) keV 669(34) ns IT 131In (17/2+)
132In 49 83 131.932998(64) 202.2(2) ms β− (87.7%) 132Sn (7−)
β−, n (12.3%) 131Sn
β−, 2n? 130Sn
133In 49 84 132.93807(22)# 163.0(16) ms β−, n (85%) 132Sn (9/2+)
β− (15%) 133Sn
β−, 2n? 131Sn
133mIn 330(40)# keV 167(11) ms β−, n (93%) 132Sn (1/2−)
β− (7%) 133Sn
134In 49 85 133.94421(22)# 140(4) ms β−, n (65%) 133Sn 7−#
β−? 134Sn
β−, 2n (<4%) 132Sn
134mIn 56.7(1) keV 3.5(4) μs IT 134In (5−)
135In 49 86 134.94943(32)# 103(3) ms β− 135Sn 9/2+#
β−, n? 134Sn
β−, 2n? 133Sn
136In 49 87 135.95602(32)# 86(9) ms β− 136Sn 7−#
β−, n? 135Sn
β−, 2n? 134Sn
137In 49 88 136.96154(43)# 70(40) ms β− 137Sn 9/2+#
β−, n? 136Sn
β−, 2n? 135Sn
This table header & footer:
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  1. mIn – Excited nuclear isomer.
  2. ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
  3. # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
  4. # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  5. Modes of decay:
    EC: Electron capture


    IT: Isomeric transition
    n: Neutron emission
    p: Proton emission
  6. Bold italics symbol as daughter – Daughter product is nearly stable.
  7. Bold symbol as daughter – Daughter product is stable.
  8. ( ) spin value – Indicates spin with weak assignment arguments.
  9. Order of ground state and isomer is uncertain.
  10. Used in medical applications
  11. Fission product
  12. Primordial radionuclide
  13. Order of isomers is uncertain.

See also

Daughter products other than indium

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